/*
 * Copyright (c) 2015 4 17
 * Name:wuPeiJi
 * QQ:757671834
 */

package kali.wpj.kali.util;

import android.os.Environment;
import android.os.StatFs;
import android.util.Log;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * Created by wpj on 2015/4/17.
 */
public class SDCardUtils {
    private SDCardUtils()
    {
		/* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    /**
     * 判断SDCard是否可用
     *
     * @return
     */
    public static boolean isSDCardEnable()
    {
        return Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED);

    }

    /**
     * 获取SD卡路径
     *
     * @return
     */
    public static String getSDCardPath()
    {
        return Environment.getExternalStorageDirectory().getAbsolutePath()
                + File.separator;
    }

    /**
     * 获取SD卡的剩余容量 单位byte
     *
     * @return
     */
    public static long getSDCardAllSize()
    {
        if (isSDCardEnable())
        {
            StatFs stat = new StatFs(getSDCardPath());
            // 获取空闲的数据块的数量
            long availableBlocks = (long) stat.getAvailableBlocks() - 4;
            // 获取单个数据块的大小（byte）
            long freeBlocks = stat.getAvailableBlocks();
            return freeBlocks * availableBlocks;
        }
        return 0;
    }

    /**
     * 获取指定路径所在空间的剩余可用容量字节数，单位byte
     *
     * @param filePath
     * @return 容量字节 SDCard可用空间，内部存储可用空间
     */
    public static long getFreeBytes(String filePath)
    {
        // 如果是sd卡的下的路径，则获取sd卡可用容量
        if (filePath.startsWith(getSDCardPath()))
        {
            filePath = getSDCardPath();
        } else
        {// 如果是内部存储的路径，则获取内存存储的可用容量
            filePath = Environment.getDataDirectory().getAbsolutePath();
        }
        StatFs stat = new StatFs(filePath);
        long availableBlocks = (long) stat.getAvailableBlocks() - 4;
        return stat.getBlockSize() * availableBlocks;
    }

    /**
     * 获取系统存储路径
     *
     * @return
     */
    public static String getRootDirectoryPath()
    {
        return Environment.getRootDirectory().getAbsolutePath();
    }
    /**
     * 在SD卡上创建目录
     *
     * @param dirName
     */
    public static File creatSDDir(String dirName) {
        File dir = new File(dirName);
        Log.i("dir",dir.getAbsolutePath());
        if(!dir.exists())
        dir.mkdir();
        return dir;
    }
    /**
     * 在SD卡上创建文件
     *
     * @throws IOException
     */
    public static File creatSDFile(String fileName) throws IOException {

        File file = new File(getSDCardPath() + "TimeFSafe/"+fileName);
        file.createNewFile();
        return file;
    }
    /**
     * 判断SD卡上的文件夹是否存在
     */
    public static boolean isFileExist(String fileName){

        File file = new File(getSDCardPath() + fileName);
        file.delete();
        return file.exists();

    }
    /**
     * 将一个InputStream里面的数据写入到SD卡中
     */
    public static File writeToSDFromInput(String path,String fileName,InputStream input){

        File file =null;
        OutputStream output =null;
        try{
            System.out.println("path：" + path + "Filename" + fileName);
            creatSDDir(path);

            file = creatSDFile(fileName);
            System.out.println("file="+file.getAbsolutePath());

            output = new FileOutputStream(file);
            byte buffer [] = new byte[1024];
            int len  = 0;
            //如果下载成功就开往SD卡里些数据
            while((len =input.read(buffer))  != -1){
                output.write(buffer, 0, len);
                String s = new String(buffer, "UTF-8");
                System.out.println("-------downing-----------------" + s);
            }
            output.flush();
        }catch(Exception e){
            e.printStackTrace();
        }finally{

            try{
                input.close();
                output.close();
            }catch(Exception e){

                e.printStackTrace();
            }
        }
        Log.i("finalPath：",file.getAbsolutePath());
        return file;
    }

}
